《整式的加减》专项练习题(有答案).docx

彳整式的加减练习100题1.3(a+5b>-2(ba>2.3a-<2b-a>+b3、2(2a+9b)+3(-5a-4b)4、(x,-2y,-3x7)(3x,-3y,-7x2y)5、3xU7x-(4x-3)-2x16、(2x>,-y>-(-y+yx>7、5(a3ab-)-2<a-7ab)8、(-2ab+3a)-2(2a-b)+2ab9、(7mn-5mn)-<4mn-5mn)10、<5a2a-l>-4(3-8a+2a').11、3xiy+3x>"+2xy2xyr12、2<a-l)-(2a-3)+3.13、-2<ab-3a)-2M(5ab+a>+2ab14, (x>x>+y)-3<Mxy2y>15, 3x-(7x-(4x-3)-2x|16、a-2<a2b-2a2c>-<2bc+ax)：17、2y'+(3xy2x2y>-2<xy2y,).18、2(2x-3y)-(3x+2y+l>19. -<3a-lab)+a-2<2a+2ab).20. 5m-7n-8>+5n9mp;21. (5xjy-7xy,>-(xy1-3x,y)s22. 3(-3a-2a)a-2(5a-4a+l>-3a).23、3a-9a+5-(-7a+IOa-5):24. 3a<2abja)(2ajb+4ab,).25. (5a-3a,+1>-<4a-3a,):26、-2(ab-3a1)-2b-<5ab*a)+2ab27、(8.ry-r+)+(-+.x2-8.xy);28«(2.r-+3x)-4<.v-+-):2229、3-7-(4-3)-2-.30、5a+(4b-3a>-<-3a+b>:31.Qa2-3ab+2b1)+(a2+2ab-2b2)t32、2a2b+2abt-2(-1)+2ab2+233、(2a-l+2a)-3<a-l+a,);34、2(x-xy)-3<2x<-3xy)-2(x-(2x-xy+yOJ.23335、-二-2A+(o)-134436、(8x+)+s37、2x-(3a2ry+3)-(5y2)：38、-(3+2h)+(4-3h+l)-(2a-Z>-3)39、4j-(-6.r')+(-9r,)40、3Zxy+2y.r+6.xy-4.rvil,13(2a5÷a)+12(2a-3a).42、lr-(5.v+(3-2):43、(3fl'6-')(aif+3a%)142x-3y+3x-2(3-y)J45、(-2+5+4)+(-r,+5-4)46、(5a1-2a+3)-<l-2a+a2)+3(-l+3aa2).47x5(3a1b-ab2>-4<-ab2+3a2b).48. 4a2+2<3ab-2a2)-(7ab-l).I,I、>'+(.ty)49、24-2y2-(-3y2x)50. 5a2-Ia1-(5a2-2a>-2(a2-3a)151. 5m-7n8>+5n-9m+8p52. (5x7-7xyO-(xy-3xy)53、3×7-2xly-3(2xy-xy)-xy!二54、3x2-(5x-4(2-1)+Sx2_1.55»2a3b-2a-a*2a2t>-ab,;98、己知112+3mn=5,5m2-(+5m2-(2m2-nn)-7mn-5的值99、设A=22-3xy+y2+2x+2y,B=4x2-6xy+2y2-3x-y,若x-2a+<y-3)2=0,且B-2A=a,求a的值.100、有两个多项式：A=2(r-4fl+l,B=2(-2)+3,当。取随意有理数时，请比较A与B的大小.答案：1、3(a+5b)-2<b-a)=5a+l3b2.3a-<2ba>+b=4a-b.3、2(2aj÷9b)+3(-5a-4b)=Ila2+6b*4、(x'-2y'-3x2y)-(3x,-3y,-7x2y)=-2xuy'Mx2y43x>-7x-(4x-3)-2×>=5x»-3x-36、(2xyy)<y+yx)=Xy7,5(a:,b3ab2>2<a*b-7ab)=-a:b+llab8、(-2ab+3a>-2(2a-b)+2ab=-2a*b9、(7mn-5mn)-(4mn-5mn)=3m'n10,<5a2a-l)-4(3-8a+2a-)=-3a'+34a-13!1.-3x2y+3xyi+2x2y-2xy2=-x:y+xyj12、2<a-l)-(2a-3)+3.=413、-2(ab-3a2)-2b2-(5ab+a2>+2ab三7a:+ab-2b214、(x2-xy+y)-3<xi+xy-2y>=-2x2-4xy+7y15,3x,-7x-<4x-3)-2x'=5x'-3x-316、a2b-2(a-2a1c>-(2bc+a)三-a+2bc÷6ax17、-2>,+(3x-x2y>-2<xy2-y,)=xy2-x2y18、2(2x-3y>-(3x+2y+l)=2x-8y-l19、-(3aMab)+a，-2(2a+2ab>=2a2-4a20、5m-7n-8p÷5n-9m-p=-4m-2n-9p21、<5x1y-7xy2)-(xy2-3xjy)=4XyMXly22、3(-3a=-2a)-(aj-2<5a-4a:+l)-3aJ=-l8a>+7a+223、3a>-9a+5(-7a>+IOa-5)=IOa>-19a+IO24、-3a>b<2alv-aib)-(2aib+4ab,)=-4aib-64ab,25、(5a-3a+l)-(4a1-3aO=5a-4a+l26、-2(ab-3a-)-2b-<5ab÷a>)+2ab=7a2+ab-2b227、(8x>-+r)+(-+x2-8y)=O28、(2-1+3x)-4(-2+l)=6x2x-29、3x2-7x-(4x-3)-2a-=5x23x330、5a+(4b-3a)-<-3a+b)=5a+3b33、(2ar-1+2a)-3(a-1÷a1)=-a:-a+223335、一二abT-<r)+<÷(<j)-I34437、2x-(3x-2y+3)-(5y-2)=-x-3y-139、4j-(-6)+(-9?)=31、<3a:-3ab+2b;)+(a'+2ab2b'>=4a<ab32、2a2b÷2ab2-2(a-l)+2ab'+2).=-134、2<xy-xy)-3(2x-3xy)-2xy-(2x-xy÷y>)=-2x÷5x>,2y=ab-I36、(8Xy-F+y)+(y2+F-8Xy)=O38(3÷2fo)+(4-3fe÷1)(2z-fe3>=-a-4b÷440、3Zo*+2yx2+fvcy-4x2y=2.rr÷4i,1-3(2«h+«)+(1-2(2-3a)=2-7a42.v-5.v+(v-2)=-5x+243、(3<,Z>-ai)-(a+3a)=2ab2x-3y+3x-2(3.r-y)_gl,y45、(x2+5+4)+(-r,+5-4)=3xjx2+5x+746、(5a2-2a+3)-<l-2a+a2)+3(-l+3a-a2)=a2+9a-l47、5(3a1b-ab,)4(ab1+3a).=3a%-ab248、4a2+2<3ab2a2>-<7abl)=l-ab49.-xy+<-xy)-2Xyl(-3y2x)=-xy+xy250,5a2-(a2-(5a-2a)-2(a2-3a)=lla-8a24451、5nb7n8p÷5n9m÷8p=4nv2nS2、<5x7y-7xy,)(xy,-3xjy)=8xy-6xjo53、 3xy-(2xy-3(2xy-xy)-xy=-2xy+7xy54、 3x2-(5x-4(-1)*5x2=10x2-5x-455、2a-a3b-a2b*aab2=a3b-a2b-ab2222256、(ai+4ab-4b-)-3(ab-7(b>-ab)=-2alIab-14b57、ai,+2a+(-2a,)+(-3a,)+3a/=-3a+4a,58、5ab+(-4a2)+8ab-(-3ab)+(-ab)+4a1=8ab+8ab1-a59、<7y-3z)-(8>-5z>=y+2z60、-3(2x<xy)+4<xxy-6>=-2xf+7xy-2461、(xH-3xty-5xy1+9y5)+(-2y,+2xy-+xy-2xj)-(4xty-xj-3xy1+7y,)=O62、3x>y+2x,+3w'2xy'=-x'y+xy'63、3<a2-2ab)-2<-3ab+b2)=3a2-2b264、5ahc-(2at>-3abc-(4ab-ab21=8abc-6a2b+ah265、SmUm，+(5m-2m)-2(11F-3m)=11F-4m66、-2m-3<m-n+l)-2-l=m-3n+467、!a-(a4b-6c)+3(-2c+2b)=-Ja+IOb32668、-5a-an-(-7a,)+(-3a)=-2an69、x2y-3xy2+2yx1-y2x=3x=y-4xy2I,1,2,I,71、ab-0.4abz-azb*abz-a425471,3a-2c-I6a-(c-b)+c+(a+8b-6>)=M)a+9b-2c-672、-3(xy-2v)-(y-(Sxy+2xy=2x2-y273、化简、求值上一花(，+)一二(_2.一+1用，其中X=-2,>=-21.2333原式=2+y2-2=674,化简、求值J-2(-4/)+(-,+,/),其中*=-2,y=-.23233原式=-3x+y2=6175、-X3-2-.v,-.t*+(4x+6)5*其中X=3I23J223原式=x'+1.+6=6Q76、化简,求值(4mn>1-(m-4n)m-n=-l-3原式=5rn-3n-l=S77、化简、求值2(血>+2Zr°而')+3-(2Z-M6+为4-4"其中“=-3,b=2原式二2“'+3<而2=1278、化简.求(ft：(2x*-xyz)-2(XAyKXyZ)+(xyz-2y),其中x=l,y=2.z=-3.原式=2XyZ=679、化简，求值：5x*.(3x-2(2x-3>+7v),其中x=2.JSiA=-2x1+x-6-1680、若两个多项式的和是2x>+xy+3y,一个加式是XFy,求另一个加式.(2x)+xy+3y>>(XjXy)=x?+2xy+3y?81、若ZaUab+b，与一个多式的型是-3al2at>5bJ试求这个多式.(2a'4ab+b'>一(-3a+2ab5b2)=5a16ab+6b'82,求5y-Zry与-2xr+4xiy的和.(5-y-2ry;+(,-2n-+4.ryJ=in-+2ry83、求3f+x5与4x+72的差.<r+-5)<4-+7?)=4r+lr-984、计算5y+3x+5z?与I2y+7x-3z?的和<5y+3x+5z2)+(12y+7x-3z2)=17y+10x+2z785、计算8xy2+3x2y-22x2y+5xy工3的差<8xy:+3x:y-2)(-2x2y+5xy'-3)=5-y+3xy'+186、多项式-X*+3Xy-:y与多项式M的差是-:x,-xy+y.求多项式M13M=-x?+4xyy87、当X-J.yT时，求代数式3(x'2xy>-(3x-2y+2(xy+y)的值.原式=-8xy+y=1588、化简再求值SabcdZa?b3abc(4ab:a'b2ab?,其中a=2,b=3.C=-4原式二83al>a'b2ab'=3689、elA=a'-2ab+b2.B=a2+2ab+b2(I)求A+B：(2)求一(B-A)：+B=2a2+2b2-(B-A)=ab490、小明同学做一道为，已知两个多项式A,B.计算A+B,他误将AB若作A-B,求得9x>-2x+7,若B=v+3x2,你能否帮助小明同学求得正确答案？A=10x1+x+5A+B=!1x+4x+391、已知:M=3x+2x-l,N=-x-2+3x.求M-2N.M2N三5x*-4x+392、已知八=4.1-45+)：,8=/+冷，-5.yt求3A-B3A-B=1Ix2-I3x>+8>293、已知A=24町+mB=-.求2A-3B.2A-3B=5F+llp+2y294、已知-2|+1F=0,求5“炉一(24>一(4加-2/8)的值.原式=94>24<rb=3495.化筒求值：5abc-2ajb+3abc-2(4ab,-a,b>).其中a、b,C满意Ia-IHb21+c*=0.原式=SabC-8ab=-3296、已知a,b.Z满意：(1)已知x-2+(y+3)2=O,<2>Z是最大的负整数，化简求值:2(Xy+xyz)-3(XJy-XyZ)-4xy,=-5xy+5x>,z=9O97、已知a+b=7,ab=IO,求代数式(5ab+4a+7b)+<6a3ab>-<4ab3b)的值.原式=IOa+I0b-2iib=5098、已知11r+3mn=5,求5m-+5m-(2n-mn)-7mn-5W(ft原式=2n+6mn+5=1599、改A=2x'3xy+yz+2x+2y.B=4x？-6xy+2y,-3x-y.若x-2a+(y-3):=0.且B-2A=a.求a的值.B-2A=-7x-5y=-14a-i5=aa=-l100、有两个多项式：A=2-4÷1,B=2(a2-2)+3,当。取随意有理数时，谓比较A与B的大小.A=2<-4+IB=2<-4<j+3所以A<B